Power Management for Wearable Devices

1. A method, comprising: taking, by a physiological sensor of a wearable device, a first measurement of a physiological parameter of a subject according to a first sensor configuration; measuring, by an activity sensor of the wearable device, a current activity level of the subject; comparing, by a processing device of the wearable device communicatively coupled to the activity sensor, the current activity level of the subject to a previous activity level of the subject; in response to the current activity level of the subject being in a first range that ranges from the previous activity level to a first threshold activity level, taking, by the wearable device, a second measurement of the physiological parameter according to the first sensor configuration, the wearable device having a first power consumption level for the first sensor configuration, wherein the first sensor configuration comprises: the physiological sensor comprising a first type of sensor; the physiological sensor comprising a first combination of two or more types of sensors; the physiological sensor comprising a first quantity of sensors taking the first measurement or the second measurement; a first frequency of taking the first measurement; a first pattern of taking the first measurement a first quantity of electronic components associated with the processing device receiving power as the first measurement is taken; or a first communication configuration of the wearable device; and in response to the current activity level of the subject being outside the first range, taking, by the wearable device, the second measurement of the physiological parameter according to a second sensor configuration, the wearable device having a second power consumption level for the second sensor configuration that is different than the first power consumption, wherein the second sensor configuration comprises: the physiological sensor comprising a second type of sensor that is different than the first type of sensor; the physiological sensor comprising a second combination of two or more types of sensors, wherein the second combination is different than the first combination; the physiological sensor comprising a second quantity of sensors taking the second measurement, wherein the second quantity if different from the first quantity; a second physiological sensor of the wearable device taking the second measurement; a second quantity of sensors of the wearable device taking the second measurement, wherein the second quantity is different from the first quantity of sensors; a second frequency of taking the second measurement that is different from the first frequency; a second pattern of taking the second measurement that is different from the first pattern; a second quantity of electronic components associated with the processing device receiving power as the second measurement is taken, wherein the second quantity of electronic components is different from the first quantity of electronic components; or a second communication configuration of the wearable device that is different from the first communication configuration.

2. The method of claim 1 , wherein: the activity sensor and the physiological sensor are a single sensor; or the activity sensor comprises: a global positioning system sensor; a triangulation sensor; a location sensor; a vibration sensor; a gyroscope sensor; an accelerometer sensor; a three-dimensional accelerometer sensor; a force sensor; a pedometer; a strain gauge; a magnetometer; or a geomagnetic field sensor; and the physiological sensor comprises: a pulse oximeter sensor; an electrocardiography sensor; a fluid level sensor; an oxygen saturation sensor; a body temperature sensor; an ambient temperature sensor; a plethysmograph sensor; a respiration sensor; a breath sensor; a cardiac sensor; a bioimpedance sensor; an optical sensor; a spectrographic sensor; or a humidity sensor.

3. The method of claim 1 , wherein: the current activity level or the previous activity level comprises: a heart rate of the subject; a body temperature of the subject; a blood pressure of the subject; or a blood oxygenation of the subject; and the physiological parameter comprises: a hydration of the subject; or a blood glucose level of the subject.

4. The method of claim 1 , further comprising: in response to the current activity level being less than the previous activity level, configuring the second sensor configuration so that the second quantity of electronic components receiving power is less than the first quantity of electronic components receiving power; or in response to the current activity level being greater than the previous activity level, configuring the second sensor configuration to have a greater sampling rate or greater sampling spectrum than the first sensor configuration.

5. The method of claim 1 , wherein: the current activity level being outside the first range indicates the subject changed from engaging in a first activity to engaging in a second activity; the first activity is different from the second activity; and the first activity or the second activity includes: sleeping; sitting; walking; jogging; running; climbing; laying; standing; or stepping.

6. The method of claim 1 , wherein: in response to the current activity level of the subject being above the first range, the second sensor configuration comprises: turning off power to a communication device controlled by the processing device; a communication rate of the communication device being decreased; or the second quantity of sensors to take the second measurement being less than the first quantity of sensors; or in response to the current activity level of the subject being below the first range, the second sensor configuration comprises: turning off power to a communication device controlled by the processing device; a communication rate of the communication device being decreased; or the second quantity of sensors to take the second measurement being less than the first quantity of sensors.

7. The method of claim 1 , wherein the first type of sensor has a first power consumption rate and the second type of sensor has a second power consumption rate that is different from the first power consumption rate.

8. A wearable device, comprising: an activity sensor that measures an activity level of a subject; a physiological sensor that measures a physiological parameter of the subject; a processing device communicatively coupled to the activity sensor and the physiological sensor, wherein the processing device is configured to: set the physiological sensor to a first device configuration; receive, from the physiological sensor, a first measurement of the physiological parameter of a subject according to the first device configuration; receive, from the activity sensor, a current activity level of the subject; compare the current activity level of the subject to a previous activity level of the subject; determine a subsequent device configuration for the physiological sensor, wherein: in response to the current activity level of the subject being within a defined range of the previous activity level of the subject, the subsequent device configuration is the first device configuration; and in response to the current activity level of the subject being outside the defined range from the previous activity level of the subject, the subsequent device configuration is a second device configuration that is different from the first device configuration, wherein a first power consumption of the wearable device in the first device configuration is different from a second power consumption of the wearable device in the second device configuration; set the physiological sensor to the subsequent sensor configuration; and receive, from the physiological sensor, a second measurement of the physiological parameter measured according to the subsequent sensor configuration.

9. The wearable device of claim 8 , wherein: the physiological sensor is a set of sensors that comprises two or more discrete sensors; the first device configuration comprises a first number of discrete sensors selected to take the first measurement or the second measurement; the second device configuration comprises a second number of discrete sensors selected to take the second measurement; and the first number is different from the second number.

10. The wearable device of claim 8 , wherein: the physiological sensor is a set of sensors that comprises: a first type of sensor; and a second type of sensor that is different from the first type of sensor; the first device configuration comprises the first type of sensor taking the first measurement or the second measurement; and the second device configuration comprises the second type of sensor taking the second measurement.

11. The wearable device of claim 10 , wherein the processing device is configured to determine the subsequent device configuration is the second device configuration in response to: the current activity level is above the defined range; or the current activity level is below the defined range.

12. The wearable device of claim 8 , wherein: the physiological sensor is a set of sensors that comprises: a first type of sensor; and a second type of sensor that is different from the first type of sensor; the first device configuration comprises the first type of sensor taking the first measurement or the second measurement; and the second device configuration comprises the first type of sensor and the second type of sensor taking the second measurement.

13. A method, comprising: receiving, at a processing device of a wearable device, a first measurement of a physiological parameter of a subject according to a first device configuration of the wearable device; receiving, at the processing device, a current activity level of the subject; comparing, by the processing device, the current activity level of the subject to a previous activity level of the subject; determining, by the processing device, a subsequent device configuration for the wearable device, wherein: in response to the current activity level of the subject being within a defined range from the previous activity level of the subject, the subsequent device configuration is the first device configuration; and in response to the current activity level of the subject being outside the defined range from the previous activity level of the subject, the subsequent device configuration is a second device configuration that is different than the first device configuration; and a first power consumption of the wearable device in the first device configuration is different from a second power consumption of the wearable device in the second device configuration; applying, by the processing device, the subsequent device configuration to one or more sensors of a wearable device; and receiving, at the processing device, a second measurement of the physiological parameter measured according to the subsequent device configuration.

14. The method of claim 13 , further comprising: determining, by the processing device, that the current activity level is above the defined range, wherein: the first device configuration comprises a first measurement rate; and the second device configuration comprises a second measurement rate that is greater than the first measurement rate; or determining, by the processing device, that the current activity level is below the defined range, wherein: the first device configuration comprises a first measurement rate; and the second device configuration comprises a second measurement rate that is less than the first measurement rate.

15. The method of claim 13 , wherein: the first device configuration comprises a first quantity of a type of sensor taking the first measurement or the second measurement; the second device configuration comprises a second quantity of the type of sensor taking the second measurement; and the second quantity is different from the first quantity.

16. The method of claim 13 , wherein: in the first device configuration, a first type of sensor is selected to take the first measurement or the second measurement; in the second device configuration, the first type of sensor is deselected, and a second type of sensor is selected to take the second measurement; and the second type of sensor is different from the first type of sensor.

17. The method of claim 13 , wherein: in the first device configuration, a first type of sensor is selected to take the first measurement or the second measurement; in the second device configuration, the first type of sensor and a second type of sensor are selected to take the second measurement; and the second type of sensor is different from the first type of sensor.

18. The method of claim 13 , further comprising: determining, by the processing device, that the current activity level is above the defined range, wherein: in the first device configuration, the processing device sets a communication device of the wearable device to a first communication rate; and in the second device configuration, the processing device sets the communication device to a second communication rate that is different from the first communication rate: or determining, by the processing device, that the current activity level is above the defined range, wherein: in the first device configuration, the processing device sets a communication device of the wearable device to a first communication rate; and in the second device configuration, the processing device sets the communication device to a second communication rate that is different from the first communication rate.

19. The method of claim 13 , further comprising: determining, by the processing device, that the current activity level is above the defined range, wherein: the subsequent configuration is additionally determined based on increasing a granularity of the second measurement relative to the first measurement; or the subsequent configuration is additionally determined based on decreasing a granularity of the second measurement relative to the first measurement; or determining, by the processing device, that the current activity level is below the defined range, wherein: the subsequent configuration is additionally determined based on increasing the granularity of the second measurement relative to the first measurement; or the subsequent configuration is additionally determined based on decreasing the granularity of the second measurement relative to the first measurement.

20. The method of claim 19 , wherein changing the granularity of the first measurement or the granularity of the second measurement comprises using a different type of sensor to take the second measurement.